Add armv6 and Objective-C fragile runtime support

[NightwindDev]

This pull request aims to add armv6 support and Objective-C v1 (fragile) runtime support.

Motivation

The motivation for this PR stems from the fact that very early iOS devices were on the armv6 architecture, and iPhone OS 1 in particular ran the fragile Objective-C v1 runtime, which had a significantly different convention.

One of the main changes between the fragile runtime and the newer, Objective-C v2 runtime are the symbol names for classes. For reference:

@interface Test : NSObject
@end

@implementation Test
@end

Would produce _OBJC_CLASS_$_Test on the modern runtime, but on the old fragile runtime, we would get .objc_class_name_Test.

Testing

The outputted .tbds were tested when compiling for armv6 and were tested on iPhone OS 1 and confirmed working.

Command used:

./tbd -p -v1 --replace-platform ios <path/to/UIKit/binary> -o <path/to/output>

Compiled on macOS Sequoia on Apple Silicon.

Notice

This PR also implements #10, as it is required to get the correct platform.